Personally I loved it, I was literally cheering. The show put a lot of hype on Jon Snow, but there was always the hints that it would be Arya (only obvious in hindsight for me), its been a while since a read the books so I cant recall if there was the same amount of hype on Jon.
I was a little disappointed in the night king storyline ending so quickly and many questions not being answered, but thats more a if there had been more episodes type of issue.
I loved it too. I fist pumped the air and shouted "YES!!" when Arya got him. I think it would have been too predictable to have Jon and TNK fighting it out. And thats one of the great strengths of this series, you never knew what was going to happen.